Intro to Stats 2.5 Pt 1

Multiple Choice

Recall that the distribution of ITBS vocabulary scores among all Gary, Indiana seventh-graders is approximately normal with mean μ = 6.84 and standard deviation σ = 1.55.

How many standard deviations from the mean is the score of 4?

(Find the z-score)

• -1

• -2

• -1.83

• -2.21

Multiple Choice

Imagine the teacher of the 7th grade class took all of the student's grade level scores and found the z-score for each student. What would the shape of the distribution of z-scores look like?

• Uniform

• Bimodal

• Normally distributed

• Heavily skewed

Multiple Choice

Imagine the teacher of the 7th grade class took all of the student's grade level scores and found the z-score for each student. What would the new mean and standard deviation be?

• mean = 1

  st. dev = 1

• mean = 0

  st. dev = 1

• There is no way to tell.

• mean = 6.84

  st. dev = 1.55

Multiple Choice

Find the area under the standard normal curve that is to the left of z=0.88.

• 0.1894

• 0.8106

• 1.1750

• -1.1750

Multiple Choice

Find the area under the standard normal curve that is to the right of 0.46

• 0.1004

• .3111

• 0.6772

• 0.3228

Multiple Choice

Find the z-score for which the area to its right is 0.75

• 0.2266

• 0.7734

• -0.6745

• 0.6745

Multiple Choice

Find the area under the standard normal curve that is to the right of -1.85

• 0.0322

• 0.9357

• -0.9357

• 0.9678

Multiple Choice

Find the area under the standard normal curve that is between z=1and z=2

• 0.8641

• 0.1359

• -0.1359

• 0.1587

Multiple Choice

Find the z-score for which the area to its left is 0.45

• 0.1257

• -0.1257

• 0.6736

• 0.3264

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​Homework

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